During the Christmas season, Harley and Poison Ivy lure Bruce into a hypnotic shopping spree while Joker threatens Gotham with a sonic bomb loud enough to deafen anyone within earshot of its explosion.

Mr. Freeze returns and seeks revenge on Gotham City, with a big surprise for Batman.

Robin fights to protect a young girl with amnesia who is being stalked by her "father", who turns out to be Clayface. Having created the girl from his own body to scout out the city, he now intends to reabsorb her.

During a fight with the Scarecrow, Batgirl is ambushed on a rooftop and falls to her death. Having watched his daughter's demise, Jim Gordon blames Batman for her fate and vows revenge, even recruiting Bane in the process.

Batman tries to help Catwoman, who is being chased by a cat cult due to a statue she stole.

A genetic engineer goes overboard in creating bigger livestock and loses all his money. A year later, an army of mutant farm animals terrorize Gotham City.

Harley reflects on her first meeting with the Joker as she plots to eliminate her main competition in his attentions—Batman.